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Fiber bragg grating wavelength demodulator

A fiber grating and wavelength demodulation technology, which is applied in the direction of transmitting sensing components with optical devices, can solve the problems of small measurement range, unstable wavelength of outgoing light, and high cost, and achieve high wavelength demodulation accuracy and easy multi-channel operation , The effect of fast demodulation speed

Pending Publication Date: 2022-07-29
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Tunable filter method: The hysteresis effect of the piezoelectric ceramics of the tunable filter is obvious, the wavelength of the outgoing light is unstable, and the adaptability to harsh environments is not strong;
[0010] Scanning DFB laser method: It is greatly affected by temperature changes, the measurement range is small, and the speed is slow. It is only suitable for small-capacity fiber grating demodulation systems;
[0011] Infrared CCD spectrum demodulation method: complex process, high cost, difficult to expand channels

Method used

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  • Fiber bragg grating wavelength demodulator

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing, the technical scheme of the present invention is described in further detail:

[0032] The invention relates to a fiber grating wavelength demodulator. like Figure 4 As shown, including broadband flat light source 1, circulator 2, fiber grating 3, beam splitter 4, several narrow-band transmission filters 5, 6, 7, 8, photodiodes 9, 10, 11, 12, transimpedance amplifiers 13, 14, 15, 16 and differential amplifier circuits 17, 18, 19; two adjacent narrow-band transmission filters 5, 6, 7, 8 have different inclination angles, and the corresponding amplifier and differential circuits 17, 18, 19 A wavelength demodulation channel is formed.

[0033] The filters are combined in pairs to form several channels. The photodiodes 9, 10, 11, 12 are InGaAs diodes. The optical signals of the narrow-band transmission filters 5 , 6 , 7 and 8 are received by the InGaAs diodes 9 , 10 , 11 and 12 and converted into current signals.

[0034...

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Abstract

The invention discloses a fiber bragg grating wavelength demodulator which comprises a broadband flat light source, a circulator, a fiber bragg grating, a beam splitter, a plurality of narrow-band transmission optical filters, a photodiode, a trans-impedance amplifier and a differential amplification circuit. The inclination angles of two adjacent narrow-band transmission optical filters are different, and the narrow-band transmission optical filters and the corresponding amplification and differential circuits form wavelength demodulation channels. The narrow-band transmission optical filters with different preset angles are utilized to realize that the change relation of transmission light intensity along with the increase of wavelength is just opposite, a photodiode is utilized to convert an optical signal into a current signal, and a trans-impedance amplifier is utilized to convert the current signal into a voltage signal and amplify the voltage signal; and the two voltage signals are differentiated and amplified by a differential amplifier to obtain the relationship between the differential signal and the central wavelength of the FBG. Compared with other FBG wavelength demodulation devices, the wavelength demodulation device has the advantages that the structure is simple, the demodulation speed is high, the demodulation speed is about 100 MHz, and the demodulation precision is about + / -5 pm.

Description

technical field [0001] The invention belongs to the wavelength demodulation technology of fiber grating, in particular to a fiber grating wavelength demodulator. Background technique [0002] The center wavelength of fiber grating FBG is directly related to parameters such as stress, temperature, oscillation, etc. It has anti-corrosion, anti-electromagnetic interference, good long-term stability, small size, light weight, reusability, fatigue resistance, and can be embedded in composite material structure Moderate advantages, widely used in wind turbine blade strain measurement, mine tunnel monitoring, aircraft engine temperature measurement, oil well detection and so on. Through the fiber grating FBG wavelength demodulation, parameters related to parameters such as stress, temperature, and oscillation can be measured, and it has the characteristics of high sensitivity and high precision. [0003] The traditional method of measuring the wavelength change is to directly use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35338
Inventor 胡二涛李安康韦玮余柯涵郑加金王博永王静
Owner NANJING UNIV OF POSTS & TELECOMM
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